Yes, mini-8 has less loss than RG58. How long is the cable run?
I haven't actually measured it yet, but the antenna will be in the attic more or less over my office where the scanner is. So I would think less than 50'.
Another perhaps dumb question - is it possible to share the scanner signal over the existing CATV coax that supplies my internet broadband feed into my office? For example, connect the antenna to a splitter in the attic to the existing CATV coax, then connect another splitter in the office for my internet and scanner connections?